It doesn't have to be verbatim, but basically it should say;
I certify that this aircraft was built with materials and instructions provided by Vans Aircraft Inc. I have inspected it and consider it eligible for an experimental airworthiness certificate for the purpose of Operating Light-Sport Aircraft under the provisions of FAR part 21.191(i)(2).
Signed______________________________ Date___________
Personally I provide a sticker for this. Other DARs may also.